Provider checker API

[Zensey]

VPN 2.0 monitoring.

Summry of task:
Essentially, the program should get the connection parameters from the API, raise the connection and make sure that it works.
Establishing a VPN connection to wireguard must be done through the wg+gvisor combination, because raising a real network interface is not convenient especially in could environments, so a VPN connection that works entirely from code would be very useful.

Implementation notes:
Check of provider's functioning is done by requesting to http://1.1.1.1

Example of use
.\build\myst\myst.exe --provchecker --log-level=error daemon

Api
http://localhost:4050/prov-checker?id=0x020dd683990895d0f81a47702161f1d29d209976

Response:
{"status":true,"error":null,"provider_id":"0x020dd683990895d0f81a47702161f1d29d209976"}

Batch mode (check many providers):

curl.exe -vvv -H "Content-Type: application/json" \
  http://localhost:5050/prov-checker-batch \
  -d '["0x020dd683990895d0f81a47702161f1d29d209976","0x1a52807858619c4acb2a075b659a86dbe459bc98"]'

Response:

[
  {
    "status": false,
    "error": "err_connect",
    "provider_id": "0x020dd683990895d0f81a47702161f1d29d209976"
  },
  {
    "status": true,
    "error": null,
    "provider_id": "0x1a52807858619c4acb2a075b659a86dbe459bc98"
  }
]

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 771 lines in your changes are missing coverage. Please review.

Project coverage is 36.60%. Comparing base (4a517cd) to head (cc91377).
Report is 73 commits behind head on master.

Files	Patch %	Lines
core/connection/manager-diag.go	0.00%	566 Missing ⚠️
tequilapi/endpoints/connection-diag.go	0.00%	191 Missing ⚠️
core/connection/pinger.go	0.00%	10 Missing ⚠️
config/flags_node.go	0.00%	2 Missing ⚠️
services/wireguard/connection/connection.go	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6047      +/-   ##
==========================================
- Coverage   37.90%   36.60%   -1.31%     
==========================================
  Files         371      374       +3     
  Lines       20665    21486     +821     
==========================================
+ Hits         7833     7864      +31     
- Misses      12054    12839     +785     
- Partials      778      783       +5     

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[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.